Sound-box for talking-machines.



PATENTED APR. 21, 1908 T. KRAEMER.- SOUND BOX FOR TALKING MACHINES.

APPLICATION FILED DEO.21, 1907.

'INVENTOR ATTORNEY NITED STATES PATENT oFFIoE.

THOMAS KRAEME or PHILADELPHIA,

SHEBLEMH Barron or PENNSYLVANIA.

PENNSYLVANIA, ASSIGNOR TO HAWTHORNE & UFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA,-A CORPO- SOUND-BOX FOR TALKING-MACHINES.

Specification of Letters Patent.

Patented April 21, 1908.

Application filed December 21, 1907. Serial No. 407,577.

To all whom it may concern:

Be it known that I, THOMAS KRAEMER, a citizen of the United States, residing in the cityand county of Philadelphia, State of -Pennsylvania,- have invented certain new and useful Improvements in Sound-Boxes for Talking-Machines, of which the following is a specification.

This invention relates to talking machines and has reference, more particularly, to sound-boxes for use therewith.

The invention is directed to the provision of asound-box of an improved construction in the use of which a sound reproduction of superior tone quality is obtained and one which is, to a large extent, free from foreign sounds. This is accomplished by the em ployment of an improved form of dia hragm 1n the sound-box, this being a meta '0 disk havin secured thereto a small body of nonmeta '0 material which lies between the diaphragm and the lever by which the diaphra 'm is vibrated. The material from whic this body is formed may be varied as desired and with different materials, reproductions differing in tone uality are obtained. Thus a small disk of eavy paper or of blotting lilaper heavily calendered may be employed, t 's disk bein fixed 'to the center of the diaphragm. Pre erabl the soundbox is so constructed that t e diaphra mmay be readily withdrawn therefrom an a number of diaphragms having non-metallic bodies of different materials fixed thereto are provided. The user'of the sound-reproduc- 'lllg apparatus may then select and use the diaphragm which, under the articular conditions prevailing, will give t e most faithfu'l reproduction. Moreover, my improved sound-box is so constructed that it may be manufactured at low cost and the danger of breakage or displacement of the parts is reduced to a mimmum.

' Thereferred embodiment of my invention is i ustrated in the accompanying drawin s in which i e 1 is a sectional elevation of a soundbox, igs. 2 and 3 are views of opposite sides of the-diaphragm and Fig. 4 is a sectional view of the dia hragm, the s'ection'line being transverse to t at of Fig. 1.

Referring to the drawings, the sound-box. is shown ashaving a main wall 1, an opening therethrough with which the sound-conveying tube is adapted to be connected, and a circular flange 3 at the outer edge of the wall -1 forming the outer'wall of the box. Fitting closely within wall 3 is a rubber strip or ring 4 formin a support for the diaphragm 5, this ring eing retained in position by a circular ridge 6 integral with and rising from wall 1. The styluslever 7 is pivotally mounted upon wall 3 and at its outer end has an opening therein to. receive a stylus 8, the latter being held in position by a set-screw 9. In the present instance I have shown the stylus-lever as provided with notched lugs 10 on opposite sides thereof which receive knifeedges on a sheet-metal piece 11 secured to Wall 3. The end 12 of this piece is bent over and bears on lever 7, exerting a spring tension thereon tending to turn the lever about the knife-edges as pivots ina direction to press the inner end of the lever against the diaphragm.

The diaphragm 5 is a sheet-metal disk preferably pressed so that the central portion is slightly displaced from .the plane of the edge portion. At the center of the disk 5 is secured a small disk 13 of non-metallic material as paper, this being heldin place by an annulus 14 of light sheet-metal at opposite edges of which are integral tangs 15 extending through openings, in disk' 5 and turned over against the disk as shown in Figs. 3 and 4. The inner end of the styluslever 7 extends through the opening in the annular casing 14 and bears on the disk 13.

,By this construction, the vibrations of the diaphragms constructed as shown may be manufactured at low cost and there is tle liability of displacement of the parts as it will be seen that the structure is simple and the number of arts small. The sound-box is so constructe that the diaphragm may be readily removed, this requiring merely that the stylus-lever be turned on its pivot against Letters Patent of the United States is 1. A sound-box having a diaphragm, a thin fiat piece of non-metallic material, a casing therefor securing said piece to the diaphra m, a stylus-lever pivotally mounted on'a wa of the box and bearing at its inner end on said piece and a stylussecured to the outer end 0 scribedf p 2.- A sound-box having a diaphragm, a thin flat piece of non-metallic material, a casing therefor securing said piece to the diaphragm, said casing having an opening the lever, substantially as detherethrough, a stylus-lever pivotallymountssaaeo ed on a Wall of the box and having its inner end extending through the opening in said casing and bearing on said piece, and a stylus secured to the outer end of the lever, sub

phragm and holding the casing and disk thereto, a stylus-lever pivotally mounted on a wall of the box and having its inner end extending through the opening in said casing and bearing on said disk and a stylus secured to the outer end of said lever, substantially as described.

This specification si ned and witnessed this 18th day of Decem er, 1907.

THOMAS KRAEMER.

Witnesses: Y

JOHN A. ZOELLS, D. S. EDMoNns. 

